Containment class A sealing test verification test device

Abstract

The utility model belongs to the technical field of nuclear power, and discloses a safety shell A-class sealing test verification test device. Wherein the pipeline is communicated with the air compressor and the containment, the air compressor and the flow meter are both in communication connection with the control assembly, the air compressor can inject compressed air into the containment, the flow meter is used for measuring the flow of the compressed air injected into the containment, and the pressure sensor is used for detecting the pressure in the containment. And the temperature and humidity sensor is used for detecting the temperature and humidity of air in the containment. According to the verification test device, accurate control over the flow of compressed air filled into the containment is achieved, an original verification mode of discharging radioactive gas outwards is replaced, the method of filling gas into the containment is adopted, the effectiveness and correctness of equipment and a method used for a containment A-class sealing test are verified in the pressurized state of the containment, and the safety and reliability of the containment A-class sealing test are improved. Radioactive gas discharged to the outside by the containment during the verification test is reduced, and the safety and the accuracy of the verification test device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power, in particular to a verification test device for the Class A airtightness test of a containment vessel. Background Art

[0002] The containment vessel of a nuclear power plant is the most important airtight safety barrier to prevent the escape of radioactive substances from the nuclear reactor. Therefore, it is necessary to regularly conduct airtightness tests on the containment vessel before the nuclear power plant is built and loaded with fuel and during the operation life of the reactor. By checking the leakage risk, ensuring that the leakage rate is within the allowable limit, and guaranteeing the safe operation of the nuclear power plant. After the Class A airtightness test of the containment vessel is completed, it is also necessary to verify the correctness and effectiveness of the equipment and methods used in the Class A airtightness test of the containment vessel.

[0003] The existing verification test method for the Class A airtightness test of the containment vessel is to open an isolation valve of the containment vessel to create a pressure relief path. By installing a flow meter on the pressure relief pipeline and adjusting the opening degree of the valve to artificially create a leakage path, and controlling the leakage rate within a certain range, the overall leakage rate of the containment vessel is measured, and the calculated leakage rate result is compared with the known leakage rate to verify whether the equipment and methods used in the Class A airtightness test of the containment vessel are correct and reliable. However, this method will cause more radioactive gas emissions when opening the isolation valve, and it is difficult to accurately operate and control the leakage rate manually by adjusting the valve. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a verification test device for the Class A airtightness test of a containment vessel to solve the problems that the existing verification method for the Class A airtightness test of a nuclear power plant containment vessel will cause more radioactive gas emissions and it is difficult to accurately operate and control the leakage rate manually by adjusting the valve.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] On the one hand, the utility model provides a verification test device for the Class A airtightness test of a containment vessel, which is used to verify the correctness and effectiveness of the equipment and methods used in the Class A airtightness test of the containment vessel. The verification test device for the Class A airtightness test of the containment vessel includes a control component, an air compressor, a flow meter, a pipeline, a pressure sensor and a temperature and humidity sensor. The pipeline connects the air compressor and the containment vessel. The air compressor can inject compressed air into the containment vessel. The flow meter is used to measure the flow rate of the compressed air injected into the containment vessel. Both the air compressor and the flow meter are communicatively connected to the control component. The pressure sensor is used to detect the pressure inside the containment vessel. The temperature and humidity sensor is used to detect the temperature and humidity of the air inside the containment vessel.

[0007] As a preferred technical solution of the above-mentioned containment Class A leak-tightness test verification test device, the control assembly includes a control circuit board, and the control circuit board is communicatively connected to the air compressor and the flowmeter respectively.

[0008] As a preferred technical solution of the above-mentioned containment Class A leak-tightness test verification test device, the control assembly further includes a host computer, and the host computer is communicatively connected to the control circuit board.

[0009] As a preferred technical solution of the above-mentioned containment Class A leak-tightness test verification test device, the containment Class A leak-tightness test verification test device further includes a cooler, and the cooler is arranged on the pipeline and can adjust the temperature of the compressed air in the pipeline.

[0010] As a preferred technical solution of the above-mentioned containment Class A leak-tightness test verification test device, the containment Class A leak-tightness test verification test device further includes an air dryer, and the air dryer is arranged on the pipeline and is located between the cooler and the containment, and the air dryer can dry the compressed air in the pipeline.

[0011] As a preferred technical solution of the above-mentioned containment Class A leak-tightness test verification test device, the containment Class A leak-tightness test verification test device further includes a filter, and the filter is arranged on the pipeline and is located between the air dryer and the containment, and the filter can filter the compressed air in the pipeline.

[0012] As a preferred technical solution of the above-mentioned containment Class A leak-tightness test verification test device, the containment Class A leak-tightness test verification test device further includes a first isolation valve, and the first isolation valve is arranged on the pipeline and is located between the containment and the filter, and the first isolation valve can control the opening and closing of the pipeline, and the flowmeter is located between the filter and the first isolation valve.

[0013] As a preferred technical solution of the above-mentioned containment Class A leak-tightness test verification test device, the first isolation valve is communicatively connected to the control assembly.

[0014] As a preferred technical solution of the above-mentioned containment Class A leak-tightness test verification test device, the containment Class A leak-tightness test verification test device further includes a second isolation valve, and the second isolation valve is communicatively connected to the control assembly, and the second isolation valve is arranged on the pipeline and is located inside the containment, and the second isolation valve can control the opening and closing of the pipeline.

[0015] As a preferred technical solution of the above-mentioned containment Class A tightness test verification test device, the air flow rate range that the air compressor can provide is 0.75La - 1.25La, where La is the maximum leakage rate allowed when the containment reaches the design pressure under the design basis accident condition, that is, the maximum leakage rate allowed for the containment Class A tightness test.

[0016] Advantages of the present utility model:

[0017] The containment Class A tightness test verification test device provided by the present utility model is used to verify the correctness and effectiveness of the equipment and methods used in the containment Class A tightness test. The containment Class A tightness test verification test device includes a control component, an air compressor, a flow meter, a pipeline, a pressure sensor, and a temperature and humidity sensor. The pipeline connects the air compressor and the containment. The air compressor can inject compressed air into the containment. The flow meter is used to measure the flow rate of the compressed air injected into the containment. Both the air compressor and the flow meter are communicatively connected to the control component. The pressure sensor is used to detect the pressure inside the containment, and the temperature and humidity sensor is used to detect the air temperature and humidity inside the containment. When it is necessary to verify the containment Class A tightness test, the control component controls the air compressor to start. The air compressor compresses the outside air into the pipeline and injects it into the containment. Before the compressed air enters the containment, the flow meter accurately measures the flow rate of the compressed air injected into the containment in real time and feeds it back to the control component. The control component receives the flow signal from the flow meter and controls the rate of the compressed air charged into the containment by the air compressor, thereby realizing precise control of the flow rate of the compressed air charged into the containment. The pressure sensor is arranged inside the containment and can detect the pressure inside the containment. The temperature and humidity sensor arranged inside the containment detects the temperature and humidity of the air inside the containment. By calculating the change in the dry air mass inside the containment, the overall leakage rate of the containment can be obtained. This test device replaces the original pressure relief method of discharging radioactive gas outward, adopts the method of inflating the containment, and verifies the correctness and effectiveness of the equipment and methods used in the containment Class A tightness test under the pressurized state of the containment, which can effectively reduce the radioactive gas discharged from the containment to the outside during the verification test and improve the safety and accuracy of the containment Class A tightness test verification test device. Description of the drawings

[0018] Figure 1 is a schematic structural diagram of the containment Class A tightness test verification test device provided by the present utility model.

[0019] In the figure:

[0020] 1. Air compressor;

[0021] 2. Flow meter;

[0022] 3. Pipeline;

[0023] 4. First isolation valve;

[0024] 5. Containment;

[0025] 6. Cooler;

[0026] 7. Air dryer;

[0027] 8. Filter;

[0028] 9. Second isolation valve. Detailed implementation manners

[0029] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only parts related to the present utility model rather than all structures are shown in the accompanying drawings.

[0030] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0031] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but are in contact through other features therebetween. Moreover, the first feature being "above", "above the", and "on the" of the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below the", and "under the" of the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal height than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "right", and other orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0033] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0034] See Figure 1 , the containment Class A leak-tightness test verification test device provided in this embodiment is used to verify the correctness and effectiveness of the equipment and methods used in the containment Class A leak-tightness test. The containment Class A leak-tightness test verification test device includes a control component, an air compressor 1, a flow meter 2, a pipeline 3, a pressure sensor, and a temperature and humidity sensor. The pipeline 3 connects the air compressor 1 and the containment 5. The air compressor 1 can inject compressed air into the containment 5. The flow meter 2 is used to measure the flow rate of the compressed air injected into the containment 5. Both the air compressor 1 and the flow meter 2 are communicatively connected to the control component. The pressure sensor is used to detect the pressure inside the containment 5, and the temperature and humidity sensor is used to detect the air temperature and humidity inside the containment 5.

[0035] When a verification test needs to be carried out on the containment 5, the control component controls the air compressor 1 to start. The air compressor 1 compresses the outside air into the pipeline 3 and injects it into the containment 5. Before the compressed air enters the containment 5, the flow meter 2 accurately measures the flow rate of the compressed air injected into the containment 5 in real time and feeds it back to the control component. The control component receives the flow signal from the flow meter 2 and controls the rate of the compressed air charged into the containment 5 by the air compressor 1, thereby realizing precise control of the flow rate of the compressed air charged into the containment 5. The pressure sensor is arranged inside the containment 5 and can detect the pressure inside the containment 5. The temperature and humidity sensor arranged inside the containment 5 detects the temperature and humidity of the air inside the containment 5, calculates the dry air quality inside the containment 5, and further obtains the overall leakage rate of the containment 5. This test device replaces the original pressure relief method of discharging radioactive gas outward, adopts the method of inflating the containment 5, and verifies the correctness and effectiveness of the equipment and methods used in the containment Class A leak-tightness test under the pressurized state of the containment 5, which can effectively reduce the radioactive gas discharged from the containment 5 to the outside during the verification test and improve the safety and accuracy of the containment Class A leak-tightness test verification test device.

[0036] This containment Class A leak-tightness test verification test device has a simple structure, is easy to operate, and conforms to the concept of nuclear safety.

[0037] Specifically, the present utility model is particularly suitable for the verification test of the containment 5 Class A leak-tightness test in nuclear power plants.

[0038] Optionally, the air flow rate range that the air compressor 1 can provide is 0.75La - 1.25La, where La is the maximum leakage rate allowed when the containment 5 reaches the design pressure under the design basis accident condition, that is, the maximum leakage rate allowed for the containment Class A leak-tightness test.

[0039] Preferably, the flowmeter 2 is selected as the flowmeter 2 with a middle range between 0.75La and 1.25La to ensure the measurement accuracy of the compressed air flow rate.

[0040] Specifically, the control component includes a control circuit board, and the control circuit board is respectively communicatively connected to the air compressor 1 and the flowmeter 2. The control circuit board can receive the flow signal of the compressed air measured by the flowmeter 2, and can control the rate of the compressed air filled into the containment 5 by the air compressor 1 according to the flow signal, and thus can accurately control and measure the flow rate of the compressed air filled into the containment 5.

[0041] Furthermore, the control component further includes a host computer, and the host computer is communicatively connected to the control circuit board. Through the connection between the host computer and the control circuit board, the host computer can receive the flow signal of the flowmeter 2 fed back by the controller and display it on the interface of the host computer in real time. At the same time, the control signal can be calculated according to the flow signal of the flowmeter 2 and transmitted to the control circuit board to adjust the rate of the compressed air filled into the containment 5 by the air compressor 1. Specifically, the host computer has a visual operation page.

[0042] Among them, the test device for verifying the Class A leak-tightness test of the containment further includes a cooler 6. The cooler 6 is arranged in the pipeline 3 and can adjust the temperature of the compressed air in the pipeline 3. The cooler 6 adjusts the temperature of the compressed air generated by the air compressor 1 so that the compressed air entering the containment 5 meets the temperature requirements of the Class A leak-tightness test of the containment.

[0043] Furthermore, the test device for verifying the Class A leak-tightness test of the containment further includes an air dryer 7. The air dryer 7 is arranged in the pipeline 3 and is located between the cooler 6 and the containment 5. The air dryer 7 can dry the compressed air in the pipeline 3. The air dryer 7 can remove the excess water vapor in the compressed air generated by the air compressor 1 so that the compressed air entering the containment 5 meets the humidity requirements of the Class A leak-tightness test of the containment.

[0044] Furthermore, the test device for verifying the Class A leak-tightness test of the containment further includes a filter 8. The filter 8 is arranged in the pipeline 3 and is located between the air dryer 7 and the containment 5. The filter 8 can filter the compressed air in the pipeline 3. The filter 8 can filter the impurities in the compressed air generated by the air compressor 1 so that the compressed air entering the containment 5 meets the cleanliness requirements of the Class A leak-tightness test of the containment. Specifically, the ability of the filter 8 to purify dust and particles larger than 3μm is 99%.

[0045] Specifically, the control component controls the start of the air compressor 1. The outside air is compressed by the air compressor 1 and enters the pipeline 3, and successively flows through the cooler 6 to adjust the temperature, the air dryer 7 to reduce the humidity, and the filter 8 to purify the dust and particles in the compressed air, and finally enters the containment 5.

[0046] Further, the verification test device for the Class A hermeticity test of the containment further includes a first isolation valve 4. The first isolation valve 4 is arranged on the pipeline 3 and between the containment 5 and the filter 8. The first isolation valve 4 can control the opening and closing of the pipeline 3. The flowmeter 2 is located between the filter 8 and the first isolation valve 4. The opening and closing of the first isolation valve 4 is controlled by the control component, thereby realizing the opening and closing of the pipeline 3.

[0047] Specifically, the verification test device for the Class A hermeticity test of the containment further includes a second isolation valve 9. The second isolation valve 9 is communicatively connected to the control component. The second isolation valve 9 is arranged on the pipeline 3 and inside the containment 5. The second isolation valve 9 can control the opening and closing of the pipeline 3. The opening and closing of the second isolation valve 9 is controlled by the control component, thereby realizing the opening and closing of the pipeline 3, which can not only enable the compressed air to smoothly enter the containment 5, but also prevent the leakage of the containment 5.

[0048] Specifically, when the verification test device for the Class A hermeticity test of the containment is accepted, it needs to satisfy: (Lam - L1 - 0.25La) ≤ Lc ≤ (Lam - L1 + 0.25La), where Lam is the leakage rate calculated and evaluated by the least squares method in the data acquisition stage; Lc is the total leakage rate calculated and evaluated after superimposing the known inflation flow rate L1 in the verification test.

[0049] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. The containment Class A leak-tightness test verification test device is used to verify the correctness and effectiveness of the equipment and methods used in the containment Class A leak-tightness test. It is characterized in that The Class A containment leak-tightness test verification test device includes a control component, an air compressor (1), a flowmeter (2), a pipeline (3), a pressure sensor, and a temperature and humidity sensor. The pipeline (3) connects the air compressor (1) and the containment (5). The air compressor (1) can inject compressed air into the containment (5). The flowmeter (2) is used to measure the flow rate of the compressed air injected into the containment (5). Both the air compressor (1) and the flowmeter (2) are communicatively connected to the control component. The pressure sensor is used to detect the pressure inside the containment (5), and the temperature and humidity sensor is used to detect the air temperature and humidity inside the containment (5). The Class A containment leak-tightness test verification test device further includes a cooler (6). The cooler (6) is arranged on the pipeline (3) and can adjust the temperature of the compressed air in the pipeline (3).

2. The containment Class A leak-tightness test verification test device according to claim 1, characterized in that, The control component includes a control circuit board, and the control circuit board is communicatively connected to the air compressor (1) and the flowmeter (2) respectively.

3. The containment A-class leak-tightness test verification test device according to claim 2, characterized in that, The control component further includes a host computer, and the host computer is communicatively connected to the control circuit board.

4. The containment Class A leak-tightness test verification test device according to claim 1, characterized in that, The Class A containment leak-tightness test verification test device further includes an air dryer (7). The air dryer (7) is arranged on the pipeline (3) and is located between the cooler (6) and the containment (5). The air dryer (7) can dry the compressed air in the pipeline (3).

5. The containment Class A leak-tightness test verification test device according to claim 4, characterized in that, The Class A containment leak-tightness test verification test device further includes a filter (8). The filter (8) is arranged on the pipeline (3) and is located between the air dryer (7) and the containment (5). The filter (8) can filter the compressed air in the pipeline (3).

6. The containment Class A leak-tightness test verification test device according to claim 5, characterized in that, The Class A containment leak-tightness test verification test device further includes a first isolation valve (4). The first isolation valve (4) is arranged on the pipeline (3) and is located between the containment (5) and the filter (8). The first isolation valve (4) can control the opening and closing of the pipeline (3). The flowmeter (2) is located between the filter (8) and the first isolation valve (4).

7. The containment Class A leak-tightness test verification test device according to claim 6, characterized in that, The first isolation valve (4) is communicatively connected to the control component.

8. The containment Class A leak-tightness test verification test device according to any one of claims 1-7, characterized in that, The Class A containment leak-tightness test verification test device further includes a second isolation valve (9). The second isolation valve (9) is communicatively connected to the control component. The second isolation valve (9) is arranged on the pipeline (3) and is located inside the containment (5). The second isolation valve (9) can control the opening and closing of the pipeline (3).

9. The containment Class A leak-tightness test verification test device according to any one of claims 1-7, characterized in that, The air flow rate range that the air compressor (1) can provide is 0.75La - 1.25La, where La is the maximum leakage rate allowed when the containment (5) reaches the design pressure under the design basis accident condition, that is, the maximum leakage rate allowed for the Class A containment leak-tightness test.

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